Posting photos question

I know this is not the right place to post this but I figured more people would see it here. I've just gotten round to working out how to post photos using the media feature after photobucketgate, but the test pic I posted was huge, like below. How do I make them smaller ?

take whatever picture file you want to post, copy it to "your desktop" (so you would see an icon of the pic on your screen), when you copy to your desktop, you can change the size to medium, etc. when you then choose a file to upload to VLJ, choose off your desktop and it will be the smaller size you saved. I am explaining it poorly but it works.